Answer: (1) FertilizerExplanation:-
Potassium nitrate is an ionic salt of potassium ions K positive and nitrate ions NO3 negative. It is an chemical compound and it’s formula KNO3.
It is a natural solid source of nitrogen. It is mostly used in fertilizer. It is soluble in hot water.It is prepared commercially by the reaction of potassium chloride with sodium nitrate.
It is transparent, colorless and powdery solid.